Question

3× - 1 =8?
9× + 2=7×?
3× - = 5×?

Answer 1

$3x - 1 = 8 \\ 3x = 8 + 1 \\ x = \frac{9}{3} \\ x = 3$

9x+2=7x
9x-7x=-2
2x=-2
x=-2/2
x= -1

a última conta tá imcompleta